Yackel ct al

ABSTRACT

PREPARATION OF LITHOGRAPHIC PRINTING PLATES BY COATING A SUBSTANTIALLY FULLY ESTERIFIED CELLULOSE ORGANIC ACID ESTER SUPPORT WITH A HYDROPHILC UNHARDENED, TANNABLE COLLOID LAYER SUCH AS GELATIN CONTAINING LIGHT SENSITIVE SILVER HALIDE, EXPOSING THE SENSITIVE COLLOID LAYER TO A SUBJECT, DEVELOPING THE EXPOSED LAYER WITH A TANNING DEVELOPING AGENT, HEATING THE DEVELOPED LAYER IN ALKALINE HYDROLYZING SOLUTION AT A TEMPERATURE OF ABOUT 110* F. TO 150* F. TO HYDROLYZE AREAS ON THE CELLULOSE ORGANIC ESTER SUPPORT AND FORM ON SAID SUPPORT AN IMAGE CORRESPONDNG TO SAID SUBJECT AND REMOVING THE COLLOID LAYER FROM SAID SUPPORT.   IN A PREFERRED ASPECT OF THE INVENTION, THE HEATING OF THE DEVELOPED LAYER IS EFFECTED BY INFRARED RADIATION.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16,

1969. 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are r arranged chronologically. The heading of each abstract indicates the number of pages of specification. including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet. 1 Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes 10 assertion as to the novelty of the disclosed subject matter.

PUBLISHED JANUARY 26, 1971 T882,023 METHOD OF MAKING A HYDROLYZED CELLULOSE ESTER PRINTING PLATE Edward C. Yackel, Pittsford, and Donald P. Foster,

Hilton, N.Y. (both Kodak Park Works, Rochester,

Filed June 19, 1970, Ser. No. 47,707 Int. Cl. G03f 7/02 U.S. CI. 96-33 1 Sheet Drawing. 11 Pages Specification Preparation of lithographic printing plates by coating a substantially fully esterified cellulose organic acid ester support with a hydrophilic unhardened, tannable colloid layer such as gelatin containing light sensitive silver halide, exposing the sensitive colloid layer to a subject, developing the exposed layer with a tanning developing agent, heating the developed layer in alkaline hydrolyzing solution at a temperature of about 110 F. to 150 F. to hydrolyze areas on the cellulose organic ester support and form on said support an image corresponding to said subject and removing the colloid layer from said support.

EYFDSURE TUNING DIVELOPIJENT Willi ALKALINE ILTIVLTM SOLUTIU" I4 ll NWMWARR SIMUIJMEUUS YANNING UEVEL PMENT AND HYDRULYSIS B! NF TING IN ALKAL NE AUIVATING SOLUUOX Fr) "0- |Z0C In a preferred aspect of the invention, the heating of the developed layer is effected by infrared radiation.

Jan. 26,1971 YACKEI- T882923 METHOD OF MAKING A HYDROLYZED CELLULOSE ESTER PRINTING PLATE Filed June 19, 1970 EXPOSURE V I I2 1 B 7? 1 W/A-m-W/A TANNING DEVELOPMENT WTTH ALKALINE ACTIVATING SOLUTION SIMULTANEOUS TANNING DEVELOPMENT AND HYDROLYSTS BY HEATING IN ALKALINE ACTIVATTNG SOLUTION llO- [20C \(HYDROLYZED I0) 1 HYDROLYZED w n w w [7 w lo j ff 11 SENSITIVE LAYER REMOVED SENSITIVE COLLOID LAYER mimogo EXPOSTURE l T ENT . HEAT WITH INFRARED 5 n I4RADIATIQN I 1, e v |o- A INVENTORS H 0R0 YZED EDWARD CARL YACKEL L Y L DONALD PAuL FOSTER L0\ I SENSITTVE COLLOID BY *3 J LAYER REMOVED ATTORNEYS 

